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J. E. CRISP, G. W. COPELAND & T. BARRETT. TACK DRIVING MACHINE.

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J. E. CRISP, COPELAND & T. BARRETT.

TACK DRIVING MACHINE.

Patented Sept 12, 1893.

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J. E. CRISP, G; W. COPELAND & '1'. BARRETT.

TACK DRIVING MACHINE. I '1 No. 505,031. Patented Sept. 12, I893.

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JOSEPH E. CRISP, OF soMEEv LLE, GEOR E W. COPELAND, OF MALDEN, AND TI- OMAS BARRETT, OF BOsTO MASSACHUsETTs, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE BOSTON LASTING MACHINE COMPANY,'OE PORT- LAND, MAINE.

TACK-DR IVI NG MACH IN E.

SPECIFICATION forming part of Letters Patent No. 505,031, dated September 12, 1893.

Application filed July 31,1891{ Serial No. 401,286. (NomodelJ To all whom it may concern:

Be it known that we, JOSEPH E. CRISP, of Somerville, and GEORGE W. COPELAND, of Maiden, in the county of Middlesex, and

THOMAS BARRETT, of Boston, county of Suffolk, State of Massachusetts, citizens of the United States, have invented new and useful Improvements in Suspended-Power Tack- Drivers, of whichthe following is-a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification. M

The invention relates to improvements in automatic machines for arranging, selecting I 5 and driving tacks, loosely. placed in a receptacle attached thereto. The objects of said improvements are to enable the operator to drive tacks inrapid succession, one after the other, and at any de sired place or angle within the field of action of the machine, Without the rebound common to suspended power operated machines of this class; and this is accomplished by suspending and balancing the machine in the manner herein set forth and by causing the automatic mechanism, which lifts the driver, to raise it, then disconnect from and leave it locked against the tension of the driving spring, while the machine is being moved 0 from point to point, whereby the tack can be driven immediately and in the Shortest period of time possible after the operator has pressed the discharging trigger of the machine.

The invention consists in mechanism for accomplishing these objects h'ereinafterdescribed and illustrated in the drawings.

It also consists of novel feeding mechanism to insure perfect driving whereby the tacks 0 are kept loose in the lower end of the chute or roadway; and are selected therefrom singly, with great precision, then positively and Suitably fed into the throat of the machine and there held until the hammer ordriver nearly reaches the tack. m It also consists in a constantly revolving elevator wheel, by means of which the chute or roadway will be supplied with sufficient tacks, during the periods of rest of the driving mechanism, to fill all demands for tacks that may be required during the periods of driving, when the machine is held at such angles that no tacks can be deliver to the receiving part ofthe chute or roadway.

Figure 1, is a side elevation of the suspended and balanced machine, with the driving pulley removed to show the manner of hangingiton thecounter-balancedar'm. Fig. 2, is a side elevation, showing enlarged, the same side as Fig. 1, part of the driving pulley and part of the suspending arm dotted in. Fig. 3, is a side elevation opposite to that of Fig. 2, showing by dotted lines, the relations to each other of receptacle for tacks, elevator wheel and roadway, by which the tacks are brought to the feeding device. Fig. 4, is a plan of the machine showing in section a portion of the suspending arm. Fig. 5, is a verticalcross section on line ww,Fig. 2. Fig. 6, is a horizontal cross section of Fig. 7, on linew 0a with cover and elevator wheel in position. Fig. 7, is a side elevation of the receptacle for loose tacks, with the cover and elevator wheel removed. Figs. 8 and 9 are cross sections on line y, y, Fig. 2, showing the relations and operation of the tack feeding mechanism. Figs. 10, 11, are cross sections on line a a Fig. 2, showing the automatic operation of the roll which raises and leaves the driver ready for action. Fig. 12,

is an elevation of the elevator wheel which revolves close to the tack chute or roadway. Fig. 1, shows substantially the ordinary method of suspending and balancing machines of this class, where the operating power is taken from anoverhead shaft.

The improvement therein, consists in formauce will cause it to automatically return to a vertical position of rest.

At the outer end of the counter balance arm, is a bearing A, into which the driving machine is hung, so that it can be rocked forward and backward as desired, the joints and counter balanced arm allowing the nozzle, a horizontal range of about twelve by twenty four inches and a vertical range of about twelve inches and the tacks may be drivenat any angle less than thirty degrees from the vertical position of rest The frame of the machine consists of the central web B, merging into the round handle B through the center of which the driving bar F reciprocates, and to the two sides of thisframe are attached the operating parts of the machine. A boss B, Fig. 2, is so located upon the web B, that when its outside is fitted to and hung in the counter balanced arm at A the driver will stand about vertical when the machine hangs free, and through the center of this boss B, is formed the bearin g for the constantly revolving main shaft C.

The frame B, forms one side of the tack receptacle B and leading from this receptacle to the feeding devices is the inclined chute or roadway B in which the tacks are arranged and: led.

The cover B of the tack receptacle has a bearing formed in its center for the shaft D, and fixed to the inner end of this shaft is the elevator wheel D the inner side of which when the cover B is secured in position by the screws B, contacts with the roadway B its cover B ,,and all that part of the side of the receptacle below the road way, for the purpose of preventing the tacks from wedging the wheel D" as it revolves among them. The tacks move into the buckets of the elevator wheel near the bottom and opposite the side next the roadway, and are delivered over the upper end of the roadway at B where the frame is inclined backward to insure freedom.

Figs. 3, 6, 7, show the relations of elevator and roadway.

The elevator D receives constant motion from the main shaft 0 by the eccentric C reciprocating the hooked pawl 0 over the teeth of the ratchet wheel D fitted to the shaft D, the retainer pawl D and spring D insuring revolution of the ratchet wheel.

Between the upper end of the roadway B and the upper end of the cap B", the top of the roadway is beveled as at B to cause the tacks that have not started correctly, to fall off, and again be elevated, the tacks which fall over the side next the elevator passing back through the center thereof and those falling over the opposite side passing around the roadway through the passage B and thence through the center of the elevator wheel. The above construction, causes most of the tacks to pass correctly under the retaining cap B of the roadway on their journey to th-efeeding devices, but some of the tacks will fall from the elevator buckets in correct line with the path of the roadway with their points resting upon the head of a correctly positioned tack, preceding them and so ride down to the cap where the point passing under said cap will act as a wedge to block the fiow of succeeding tacks. To remove such obstructions and preserve the continuity of flow, down the roadway, a picker is constructed as follows: Pivoted to the frame B at B", in proper relation to the upper end of the cap, is the swinging arm E, Figs. 2, 6, and 7, whose spring E, tends to swing it toward the upper end of the roadway, and fitted to this swinging arm is the spring picker E whose swinging end is fitted to catch any tack which may have wedged itself and move it so far away from the upper end of the cap B that said tack will fall one side or the other of the chute or road way. Automatic motion is given to the swinging arm E, by the extension E which carries the curved arm E so that its end will engage with the pins D fixed in the face of the constantly revolving ratchet wheel D which pins press back and then release the arm E, and the spring E gives the picker point the desired motion. It is understood that in a machinewith the angular range given the one herein described, there are certain angles of operation, during which no tacks can be delivered into the chute or roadway and that at such times, the available supply will rapidly decrease; but the length of the chute is made sufficient to tide over periods of want and when the machine is not in active operation driving tacks, the constantly running elevator will again fill the chute or roadway ready for another call. The tack driving mechanism is constructed and operated as follows: A swinging arm- F, is hung upon an extension of the frame B, at F", and a link F connects the opposite end of this swinging arm to the driver F which is reciprocated and guided in the handle B by these connections. To raise the driver, a proper bearing F is formed upon the swinging arm F, and to this bearing is fitted the elevating roll F Figs. 3, 10, and 11, so that it can revolve; and also slide endwise to the positions shown by Figs 10 and 11. Affixed to and forming part of the constantly revolv in g main shaft 0, is the curved lifter Oflwhich revolves upon the same side of the frame B to which thearm F, is attached; and whose path of revolution will cause it to engage with theroll F and raise the swinging arm F, when the roll F is in the position shown by Fig. 10 and when the swingingarm is locked up, the wedge 0 forming the outer end of the lifter 0 ships the roll F to the position shown by Fig. 11. so that the roll can swing with the arm F, down past the lifter, no matter what its angular position, whenever it is desired to drive a tack. After the driver has descended to its full limit a shipper spring 0 ships the rollF back to the position'shown by Fig. 10, and the lifter will again raise the arm F. To insure the roll F always clearing the" lifter C, during its downward motion, a groove is formed therein as shown by Fig. 10, and a guide 0 is mounted on a swinging guidearm G which prevents the shipper spring C, from acting, only when the roll F is at its lowest point; and in case the shipper spring 0 does not move the roll F completely clear of the guide 0 the guide-arm spring 0 gives, and allows free ascent of the roll F The active or downward motion of the driver is produced by the spring F connected to the swinging arm at F and the frame at F".

The driving bar is held up against the spring F and released when it is desired to drive a tack as follows, (see Figs. 2, 3, 4:, 5:) Fixed to the swinging arm F, is a blockF, and pivoted in a bearing formed through the frame B, is the swinging dog G, whose stop pin G allows it to swing a little under the block F and hold the swinging arm F up as desired; to move this dog G, from under the block F and allow the driver to descend there is pivoted in another similar bearing below that for the dog G, the trigger G which is formed in one piece with its pivot pin G and pivoted to the upper end of this trigger is the sear G the spring of which, G presses it up, toward the lower end of the dog G(see Fig. 3) and by Fig.2, it will be seen that through the pivots of G and G are pins G G which hold these parts in place and these pins are prolonged toward the rear of the machine and connected at their outer ends by the spring G which spring and pins draw the dog and trigger into operative positions. The scar is so fitted on the trigger that when the trigger is pressed fully back, the sear passes under the arc of motion of the lower end of the dog and thus allows the dog G, to catch under the block F as soon the block F is in a position to do so; and the sear spring G yields, when the trigger G is released, so that the spring G, can draw the trigger back for another active motion. The driving bar F terminates in the driver F and below the handle 13", is fixed a guide H, to align the lower end of the driver F Below this guide is the throat H into which the tacks are delivered by the feeding finger M; this throat is made in two parts, the front having a slot for the feeding finger to reciprocate in; and below this throat is the nozzle or driveway H through which the tacks are driven. Through the inner part of the throat H and also the frame B, are fitted the yielding blocks K, Figs. 8, 9, which form part of the throat and also serve as inclined gates, to prevent the tacks from flowing from the roadway into the throat. These gates K, are pressed across the roadway by the springs K, which springs are held in position by the screw K Fig. 3; and the upper plane of these gates coincides with that of the lower end of the roadway, so that the tacks as they reach the gates will pass over and rest upon and against them. The line of separation of the gates K, is the lower edge of the slot formed in the front part of the throat for the feeding finger and so much of the upper gate or taper of shank, and as soon as the tack has entered the throat, the gates close behind it and prevent its displacement under the action of the driver. The feeding finger M, is quite thin and separates and carries the tacks from the lower end of the roadway through the gates K, to the throat, and there holds them until the driver nearly reaches their heads, when it commences to move back in a straight line, as in the common scratch feed, until it about reaches the rear of the inclined gates, of course, moving the tacks a little back, during the last part of its motion; when it has reached this point,it commences to swing out from the tack chute until it reaches the extreme backward limit of motion and this swinging out allows the tacks to fall and rest over and against the inclined sides of the gates K, as hereinbefore described. The return or feeding motion of the feeding finger is the same as that of the square or four motion feed; it moves behind the first tack on the lower end of the roadway, then pushes it into the throat and there holds it, until it is desired to driveanother tack.

The feeding finger M has the preceding motions given to it, by the following mechanism: Projecting from the side of the frame B, shown by Fig. 2, is a bearing L, for the rock shaft L the lower end of which terminates in the rocker arm L and pivoted to and below L at L is the bell crank lever M, Figs. 2, 5, 8, 9, whose longer arm, during a portion of its motion, rides upon the outer side of the throat H and to this end of the bell crank lever, the feeding finger M is secured by the binding screw M so that its point will not rub over the back side of either roadway or throat as it reciprocates. A spring M connected to this arm of the bell crank lever and to the arm L draws the point of the feeding finger M toward the roadway; the opposite and shorter arm, is slotted at M and one side of this slot engages with the pin L fixed under the center of the rock shaft L, when the feeding finger has been drawn back to about the rear of the inclined gates K, and causes the remainder of the backward motion of the rock shaft to swing the finger M outward.

Motion is given to the rocker shaft L", by the adjustable arm L secured to its upper end in the following manner: Fitted to slide in a slot N, formed through the frame 18, is the incline or wedge N, Fig. 5, and a connecting rod N connected to theswinging arm F, at F, opposite the driving spring F gives coincident reciprocation to the incline N; Fixed to a collar forming part of the rock shaft is the pin L to which is connected the spring L", which spring at all times draws the rock shaft back with reference to the feeding finger M and holds the swinging block L mounted under the outer end of the adjustable rock arm L in contact with the incline N, the incline N, being so formed with reference to the feeding finger M and the driver F that a tack is positively fed forward and held up, under the driver F until it commences its downward motion, when the feedin g finger M, will move back for another tack.

What we claim, and desire to secure by Letters Patent, is

1. In a machine for driving tacks, a constantly revolving lifter, a driving spring, a driver disconnected from its raising mechanism, in combination with a swinging spring operated dog for locking said driver against the tension of the driving spring, substantially as shown and described.

stantly revolving lifter, in combination with a driver and endwise reciprocating roll for raising said driver, and mechanism substantially as described, to reciprocate said roll at the termination of the movements of said driver, all constructed and operating substantially in the manner shown and described and for the purposes set forth.

3. In a machine for driving tacks, a feeding finger and mechanism substantially as described for carrying it, mounted on the frame of the machine, intermediate mechanism connected to the driver elevating arm, operating a reciprocating cam, which actuates said feed" finger carrying mechanism in unison with the driver and holds the feed finger at its extreme forward position, when said driver is locked up, in combination with an interposed spring operated dog for holding the driver up, and an independent trigger and gear for releasing the driver and driving the nail 0r tack held by the feeding finger, all operating substantially as shown and described.

4. In a machine for driving tacks, the combination of the elevator wheel D mounted upon an axis at right angles to the direction of the chute or roadway B with the ratchet C, substantially as shown and described.

5. In a machine for driving tacks, the combination of the chute or roadway B the picker E mounted upon the swinging arm E, and operated by the pins D of the ratchet wheel D acting upon the curved arm E armachine, the combination of the counter bal- Ianced arm A, sliding and revolving in the sleeve A, of the suspended mechanism, and the hearing A, upon one end of said arm A, 3 and the eccentric counter balance A, on the Z other end, substantially as and for the purposes shown and described.

ranged and operating substantially as shown 5 5 and described.

6. In a machine for driving tacks, the combinationofthefeedingfingerMmounted upon the bell crank lever M, provided with a slot M, with the rocker arm L and the spring M substantially as described, whereby the feeding finger is caused to move back until it loosens the tacks in the lower end of the roadway and then passes around behind the first one of them and pushes it into the throat of the driveway, and there holds it, until the driver is released.

7. In a machine for driving tacks, the combination of the feeding finger M, means substantially as described for actuating said finger, two independent gates K, which close the end of the chute or roadway B, substantially as shown and described.

2. In a machine for driving tacks, a con- 8. In a suspended oscillating tack-driving 9. In a machine for driving tacks, a constantly revolving main shaft with a cam or lifter for automatically raising the driver attached thereto,an interposed swinging springoperated dog for holding said driver up, in combination with the trigger G whereby the I operator can at will set in operation thetack driving and feeding mechanism substantially as shown and described.

10. In a machine for driving tacks suitable tack driving and feeding mechanism a constantly revolving main shaft operating an elevator wheel, in combination with cam or lifter for the driver a dog for holding the 5 driver locked up against the tension of the driving spring and a trigger and sear for releasing said driver whereby the operator can at will set in motion the driving and feeding 'mechanism, substantially as shown and described. wheel D hooked pawl O and the eccentric JOS. E. CRISP. GEORGE W. COPELAND. THOMAS BARRETT.

Witnesses:

W. A. COPELAND, G. P. MORRILL. 

